Improved machine for cutting bolts



UNITED v.STATES PATENT OFFICE.

J. A. MEnEIMAN, oE CHICAGO, ILLINOIS, Assrenon 'ro HIMsELE AND E. E.

' BoUNs, 0E SAME PLAGE.

IMPROVED MACHINE FOR CUTTING BOLTS.

Specification forming part of Letters` Patent No. 44,773, dated October 18, 1864.

To-(LZZ whom t may concern:

Beit known that I, J. A. MERRIMAN, of Chicago, in the countyof Cook and State of Illinois, have invented a new and Improved Machine for Cutting Bolts; and 'I do hereby declare that the following is a full, clear, and exact description thereof, which will enable any person skilled in the art to make and use the same, reference being had' to the accompanying drawings,making a part of this speciiication, inwhichf Y Figure 1 represents a longitudinal vertical section of my invention, taken in the plane indicated bythe line x rv, Fig. 2. Fig 2 is a transverse 'vertical section of the same, the plane of section being indicated by the line yy, Fig'a l, and looking in the direction of the arrow marked near that line. Figli is asimilar section taken in theV pla-ne indicated by the line z z, Fig. 1, and looking in the direction of the arrow marked near to that line.

Fig. 4 is a similar section, the line z'z,Fig. 1, indicating the plane of sectionand looking in the direction of the arrow marked near` that line. Fig'. 5 is a detached side elevation of the indexplate to adjust the size of opening in the dies.

Similar letters of. reference indicate like parts.

This invention'consists in a ring having eccentric recesses 'or ways provided with ribs to connect with the dies, said ribs and ways being made to expand in the direction. in which the machine revolves, in combination with a spring stationary flange, index-plate, and brake or friction-clutch in such a manner that by applying the brake to the circumference of the-ring the dies are instantly expanded or opened, which allows of the bolt being withdrawn without stopping or reversing the machine. By changing the position ofthe indexplate in relation tothe stationary iange, the

` size of the opening in the dies can be adjusted to compensate for wear in the dies,or to cut bolts of diiferent sizes.

A represents a frame, made of cast-iron or other suitable material, and provided with two guidt Ways, a, to receive the movable headblock B. In this head-block the bolts are fastened to which a screw-thread is to be cut.

C is the spindle, which carries the head D containing the dies.

Said spindle has its` bearings in two standards, C, rising from frame' A, and it is provided with a hand-wheel or pulley, d', by means of which a rotary motion can be impartedto it. vThe head D is means of a set-screw, c', or in any other suiia ble manner, andJ it is provided with three (more or less) slots c to receive .the dies et. The rear portion of the core e forms the guide for the stationary iange f, which is fastened in the proper position by the set-screwf, or in any other. suit-able manner. In front of this iiange, and fitted to move on the circumference ofthe core e. is the ringg. Firmly secured or otherwise attached to. this ring is the stud g. This stud passes through the flange f and the index-plate i in along circular slot g* and Wt, (see Fig. 4,) and is permitted' to work freely in the said slot at all times,

y2 is a scroll-shaped spring, one end of which is firmly fastened to the core e. The other end of this sprin g iits firmly in a triangular-shaped recess in the inner circumference of the ring g. There are several of these recesses, so that the spring may be taken up in case it should become slack by constant use. By the action of this spring it will be seen that the ring g is held in the same position (the stud g bearin g against the end of the slot in the index-plate) during the operation of cutting. The dies c* are retained in the slot-s e by means of the disk or face plate h, which is secured to the core c by screws h', and which is provided with a central hole, hit, to admit the screw-bolts. This face-plate, with the stationary angef, also forms the guides or lateral bearin gs for the ring g. Each of the dies is furnished with a nick, c3, near its outer end, and these nicks fit over eccentric ribs g3, which are cast solid with or otherwise rigidly attachedtothe ring. The ribs g3 are iitted Within eccentric recesses g4 in the body of the ring, and if the ring is turned on the core the dies are drawn incr pushed out by the action ofthe eccentricribs. If the ring is turned far enough to carrythe dies from one end of the eccentric ribs to theother, the radial motion imparted to said dies is equal to the dif- I ference between the largest and smallest disY .the stationary flange f by means of the screw i. By means of the circular slot it, (see Fig. 4,) through which the screw i passes, the index-p1ate may be moved in either direction,

and fastened in the desired position. rlheindex-plate is also provided with a second circular slot, iti, corresponding with the one marked gt, in the stationary iange. The end of this slot it* forms 'a stop or bearing for the stud g' while the machineis cutting thethread. rlhis arrangement is intended 'for cuttingbolts of different sizes, and also to compensate for wear in the dies.

1n order to arrest the motion ofthe ring g, and thereby open the dies to allow ofthe bolts being withdrawn after being. cut while the machine is running, a brake or friction-clutch, E, is applied to its outer circumference. This brake consists of two jaws,which embrad'e the ring and swing on pivotsj in a slot in the frame A. .The Shanks of these jawsextend down below the frame A, and connect by a spring cross-banj, from the center of which a treadle, F, is suspended by au eye-bolt,.j*. By stepping on this treadle the shanks of the two j iws are forced apart and the brake is applied.

lhe motion ot' the ring is' thereby checked, y

and the dies are instantly opened and the bolt withdrawn. The foot heilig removed the brake ceases'to act, the ring then resumes its former position by means of the spring, and the dies are ready to receive another bolt.

I do not wish to conne myself, however, to this particular construction of the brake, and this can be changed 'in various wayswithput changing materially the result of the operation.

Having thus described myinvention, I claim as new and desire to secure by Letters Patent- 1.- The brake E, applied in combination with v the ring g and dies 6*, substantially in the manner herein shown land described, so that by the application of the brake the dies are opened without stopping the machine.

2. The sprin g g", applied in combination with the ring g and dies 6*, substantially as herein specied, for the purpose of closing the dies.

J. A. Munari/[Ani Witnesses L. B. LAURENCE,` EDWD. E. Bowne. 

